fsdev/file-op-9p.h

   1 /*
   2  * 9p
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13 #ifndef _FILEOP_H
  14 #define _FILEOP_H
  15 #include <dirent.h>
  16 #include <utime.h>
  17 #include <sys/vfs.h>
  18
  19 #define SM_LOCAL_MODE_BITS    0600
  20 #define SM_LOCAL_DIR_MODE_BITS    0700
  21
  22 typedef struct FsCred
  23 {
  24     uid_t   fc_uid;
  25     gid_t   fc_gid;
  26     mode_t  fc_mode;
  27     dev_t   fc_rdev;
  28 } FsCred;
  29
  30 struct xattr_operations;
  31 struct FsContext;
  32 struct V9fsPath;
  33
  34 typedef struct extended_ops {
  35     int (*get_st_gen)(struct FsContext *, struct V9fsPath *,
  36                       mode_t, uint64_t *);
  37 } extended_ops;
  38
  39 /* export flags */
  40 #define V9FS_IMMEDIATE_WRITEOUT     0x00000001
  41 #define V9FS_PATHNAME_FSCONTEXT     0x00000002
  42 /*
  43  * uid/gid set on fileserver files
  44  */
  45 #define V9FS_SM_PASSTHROUGH         0x00000004
  46 /*
  47  * uid/gid part of xattr
  48  */
  49 #define V9FS_SM_MAPPED              0x00000008
  50 /*
  51  * Server will try to set uid/gid.
  52  * On failure ignore the error.
  53  */
  54 #define V9FS_SM_NONE                0x00000010
  55 /*
  56  * uid/gid part of .virtfs_meatadata namespace
  57  */
  58 #define V9FS_SM_MAPPED_FILE         0x00000020
  59 #define V9FS_RDONLY                 0x00000040
  60 #define V9FS_PROXY_SOCK_FD          0x00000080
  61 #define V9FS_PROXY_SOCK_NAME        0x00000100
  62
  63 #define V9FS_SEC_MASK               0x0000003C
  64
  65
  66 typedef struct FileOperations FileOperations;
  67 /*
  68  * Structure to store the various fsdev's passed through command line.
  69  */
  70 typedef struct FsDriverEntry {
  71     char *fsdev_id;
  72     char *path;
  73     int export_flags;
  74     FileOperations *ops;
  75 } FsDriverEntry;
  76
  77 typedef struct FsContext
  78 {
  79     uid_t uid;
  80     char *fs_root;
  81     int export_flags;
  82     struct xattr_operations **xops;
  83     struct extended_ops exops;
  84     /* fs driver specific data */
  85     void *private;
  86 } FsContext;
  87
  88 typedef struct V9fsPath {
  89     uint16_t size;
  90     char *data;
  91 } V9fsPath;
  92
  93 typedef union V9fsFidOpenState V9fsFidOpenState;
  94
  95 void cred_init(FsCred *);
  96
  97 struct FileOperations
  98 {
  99     int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
 100     int (*init)(struct FsContext *);
 101     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 102     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 103     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 104     int (*chown)(FsContext *, V9fsPath *, FsCred *);
 105     int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 106     int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 107     int (*remove)(FsContext *, const char *);
 108     int (*symlink)(FsContext *, const char *, V9fsPath *,
 109                    const char *, FsCred *);
 110     int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 111     int (*setuid)(FsContext *, uid_t);
 112     int (*close)(FsContext *, V9fsFidOpenState *);
 113     int (*closedir)(FsContext *, V9fsFidOpenState *);
 114     int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 115     int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 116     int (*open2)(FsContext *, V9fsPath *, const char *,
 117                  int, FsCred *, V9fsFidOpenState *);
 118     void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 119     off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 120     struct dirent * (*readdir)(FsContext *, V9fsFidOpenState *);
 121     void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
 122     ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
 123                       const struct iovec *, int, off_t);
 124     ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
 125                        const struct iovec *, int, off_t);
 126     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 127     int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
 128     int (*rename)(FsContext *, const char *, const char *);
 129     int (*truncate)(FsContext *, V9fsPath *, off_t);
 130     int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
 131     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 132     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 133                          const char *, void *, size_t);
 134     ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 135     int (*lsetxattr)(FsContext *, V9fsPath *,
 136                      const char *, void *, size_t, int);
 137     int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 138     int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 139     int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 140                     V9fsPath *newdir, const char *new_name);
 141     int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 142     void *opaque;
 143 };
 144
 145 #endif